Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×3
    Solution:
    22×3 = 66
    Column vertical calculation:

						2	2
✖							3
						6	6
						6	6

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×3
    Solution:
    40×3 = 120
    Column vertical calculation:

						4	0
✖							3
					1	2	0
					1	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×4
    Solution:
    42×4 = 168
    Column vertical calculation:

						4	2
✖							4
					1	6	8
					1	6	8

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 90×5
    Solution:
    90×5 = 450
    Column vertical calculation:

						9	0
✖							5
					4	5	0
					4	5	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 27×6
    Solution:
    27×6 = 162
    Column vertical calculation:

						2	7
✖							6
					1	6	2
					1	6	2

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 60×6
    Solution:
    60×6 = 360
    Column vertical calculation:

						6	0
✖							6
					3	6	0
					3	6	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 2×40
    Solution:
    2×40 = 80
    Column vertical calculation:

							2
✖						4	0
							0
						8
						8	0

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>>注：本次最多计算 7 道题。

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